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Bra


A bra <psi| is a vector living in a dual vector space to that containing kets |psi>. Bras and kets are commonly encountered in quantum mechanics. Bras and kets can be considered as 1-vectors and 1-forms (or vice versa), although this is almost always done only in a finite-dimensional vector space.

Considered as an inner product, the bra and ket form an angle bracket (bra+ket = bracket) <psi|psi>.


See also

Angle Bracket, Covariant Vector, Differential k-Form, Ket, L2-Inner Product, One-Form

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References

Dirac, P. A. M. "Bra and Ket Vectors." §6 in Principles of Quantum Mechanics, 4th ed. Oxford, England: Oxford University Press, pp. 18-22, 1982.

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Bra

Cite this as:

Weisstein, Eric W. "Bra." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Bra.html

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